/*
 * Copyright 2010-2020 Alfresco Software, Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.engine.impl.delegate;

import java.util.ArrayList;
import java.util.List;
import org.activiti.bpmn.model.Event;
import org.activiti.bpmn.model.FieldExtension;
import org.activiti.bpmn.model.MessageEventDefinition;
import org.activiti.engine.delegate.Expression;
import org.activiti.engine.impl.bpmn.parser.FieldDeclaration;
import org.activiti.engine.impl.el.ExpressionManager;
import org.activiti.engine.impl.el.FixedValue;
import org.apache.commons.lang3.StringUtils;

public class BpmnMessagePayloadMappingProviderFactory implements MessagePayloadMappingProviderFactory {

    @Override
    public MessagePayloadMappingProvider create(
        Event bpmnEvent,
        MessageEventDefinition messageEventDefinition,
        ExpressionManager expressionManager
    ) {
        List<FieldDeclaration> fieldDeclarations = createFieldDeclarations(
            messageEventDefinition.getFieldExtensions(),
            expressionManager
        );

        return new BpmnMessagePayloadMappingProvider(fieldDeclarations);
    }

    public List<FieldDeclaration> createFieldDeclarations(
        List<FieldExtension> fieldList,
        ExpressionManager expressionManager
    ) {
        List<FieldDeclaration> fieldDeclarations = new ArrayList<FieldDeclaration>();

        for (FieldExtension fieldExtension : fieldList) {
            FieldDeclaration fieldDeclaration = null;
            if (StringUtils.isNotEmpty(fieldExtension.getExpression())) {
                fieldDeclaration = new FieldDeclaration(
                    fieldExtension.getFieldName(),
                    Expression.class.getName(),
                    expressionManager.createExpression(fieldExtension.getExpression())
                );
            } else {
                fieldDeclaration = new FieldDeclaration(
                    fieldExtension.getFieldName(),
                    Expression.class.getName(),
                    new FixedValue(fieldExtension.getStringValue())
                );
            }

            fieldDeclarations.add(fieldDeclaration);
        }
        return fieldDeclarations;
    }
}
